JP2006270262A - Optical signal receiving device, optical signal monitoring unit and method of monitoring the optical signal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To build a simplified light transmitting system by communalizing an optical signal receiver, even when it must cope with a plurality of transmission systems. <P>SOLUTION: In an optical signal receiving device, a switching controller selects a monitoring part as a connecting destination, based on bit rate information a5 corresponding to a transmission system classification sent from a frequency detector 5, and sends the connection control signal for operating the switching unit so that the selected monitoring part is connected to a clock, a data reproducer 3 in a performance monitoring circuit 6. The monitoring part extracts the clock, alarm information from the data signal a4 sent from the data reproducer 3, and sends it to the selective connection part. When the switching controller receives the alarm information, it sends the alarm information to the apparatus on the downstream side. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an optical signal receiving apparatus, an optical signal monitoring unit, and an optical signal monitoring method, and includes an optical signal receiving apparatus having a function of monitoring an optical signal according to a bit rate of an input signal, and the optical signal receiving apparatus The present invention relates to an optical signal monitoring unit and an optical signal monitoring method independent of a bit rate.

Conventionally, in an optical transmission system, various transmission path networks having different standards have been adopted, and bit rates (transmission speeds) are also various. For example, a synchronous optical communication network / synchronous digital hierarchy (hereinafter referred to as SONET (Synchronous Optical Network) / SDH (Synchronous Digital Hierarchy) network), a fiber channel (hereinafter referred to as FC (Fibre Channel)) network, a Gigabit Ethernet ( A plurality of types of transmission line networks such as a Gigabit Ethernet (registered trademark) network (hereinafter referred to as a GbE network) are used.
Therefore, it is necessary to use a dedicated optical signal transmitter and optical signal receiver as transmission apparatuses connected via a transmission path using optical fibers, for example, for each bit rate.

  As shown in FIG. 6, for example, in a SONET / SDH network, a SONET / SDH network optical signal transmitter 102 and an optical signal receiver 103 are connected together via a transmission optical fiber 101. In a GbE network, transmission is performed. A GbE network optical signal transmitter 105 and an optical signal receiver 106 are connected to each other via the optical fiber 104. In the FC network, both the FC network optical signal transmitter 108 and the optical signal transmitter 108 are connected via the transmission optical fiber 107. An optical signal receiver 109 is connected.

The optical signal receivers 103, 106, and 109 have an optical communication monitoring function. As shown in FIG. 7, an optical / electrical conversion circuit 202 that converts an input optical signal into an electrical signal, and an input electrical signal. A clock / data recovery circuit 203 that extracts a clock signal based on the data and identifies and reproduces the data signal, and a performance monitor circuit 204 that receives the clock signal and the data signal from the clock / data recovery circuit 203 and monitors alarm information. It has become.
In each performance monitor circuit 204, the detection operation of the alarm information is different for each standard corresponding to the bit rate, for example, and is not common.

  For example, in the SONET / SDH network, overhead for transferring operation / maintenance information (error monitoring signal, alarm transfer signal, synchronization signal) is determined in order to perform efficient signal transmission. In addition, a parity check called bit interleaved parity (Bit Interleaved Parity) is performed between repeaters and between multiplexed terminals, thereby identifying a faulty section and the like.

In response to the recent demand for multimedia services, an optical signal receiver capable of receiving regardless of the protocol (bit rate) has been proposed in order to cope with the various transmission methods described above (for example, Patent Document 1, (See Patent Document 2).
In these optical signal receivers, in order to extract the alarm information contained in the transmitted signal from the data signal reproduced by the clock / data reproduction circuit, for example, different performance monitors corresponding to the bit rate are used. An optical signal receiver with a circuit must be prepared.
JP 2001-053814 A Special table 2003-509927 gazette

  The problem to be solved is that in the above prior art, an optical signal receiver having a performance monitor function must be prepared for each bit rate, for example.

  The present invention has been made in view of the above-described circumstances, and even when it is necessary to support a plurality of transmission methods, an optical signal receiver (optical signal receiving device) is shared and simplified light is provided. An object of the present invention is to provide an optical signal receiving apparatus, an optical signal monitoring unit, and an optical signal monitoring method capable of constructing a transmission system.

In order to solve the above problems, the invention described in claim 1 is an optical / electrical conversion means for converting an optical signal including alarm information into an electrical reception signal, and receiving the reception signal from the optical / electrical conversion means. In particular, the present invention relates to an optical signal receiving device comprising a reproducing means for reproducing a clock and data to generate a reproduced signal, and a transmission speed information obtaining means for obtaining transmission speed information of the reproduced signal, and at least a plurality of types having different transmission speeds And a plurality of alarm information extracting means for extracting alarm information included in the reproduction signal, and a plurality of alarm information extracting means based on the transmission speed information. A selection connection means for selecting the alarm information extraction means and connecting the selected alarm information extraction means and the reproduction means is provided.
Here, the selective connection means selects the corresponding alarm information extraction means from the plurality of alarm information extraction means based on the transmission speed information obtained from the transmission speed information acquisition means, and reproduces the alarm information extraction means. The alarm information extracting means extracts the alarm information included in the reproduction signal according to the transmission speed, so that even if it is necessary to support a plurality of transmission methods, the optical signal reception is performed. It is possible to construct a simplified optical transmission system by sharing devices.

The invention according to claim 2 relates to the optical signal receiving apparatus according to claim 1, wherein the selective connection means includes storage means for storing the transmission speed information in association with the alarm information extraction means of the connection destination. It is characterized by having.
Here, in the selection connection means, the alarm information extraction means associated with the transmission speed information stored in the storage means is selected and connected to the selected alarm information extraction means and the reproduction means. Therefore, a simplified optical transmission system can be constructed by sharing an optical signal receiving apparatus.

According to a third aspect of the present invention, there is provided the optical signal receiving apparatus according to the first or second aspect, wherein the transmission rate information acquiring means includes a frequency detecting means for detecting the frequency of the reproduction signal. .
Here, the transmission speed information acquisition means detects the frequency of the reproduction signal by the frequency detection means, obtains transmission speed information and sends it to the selective connection means, and the selective connection means is obtained from the transmission speed information acquisition means. Based on the transmission rate information, a corresponding alarm information extraction unit is selected from a plurality of alarm information extraction units, and the alarm information extraction unit and the reproduction unit are connected. Accordingly, the alarm information included in the reproduction signal is extracted, so even if it is necessary to support a plurality of transmission methods, the optical signal receiving device is shared and a simplified optical transmission system is constructed. be able to.

According to a fourth aspect of the present invention, there is provided the optical signal receiving apparatus according to the first or second aspect, wherein the reproduction means transmits clock frequency information to the transmission speed information acquisition means, and the transmission speed information acquisition means. Has a transmission rate information converting means for converting the frequency information into the transmission rate information.
Here, the reproducing means transmits the frequency information of the clock to the transmission speed information acquisition means, and the transmission speed information acquisition means converts the frequency information into the transmission speed information by the transmission speed information conversion means, to the selective connection means. Based on the transmission rate information obtained from the transmission rate information acquisition unit, the sending / selecting connection unit selects a corresponding alarm information extraction unit from among a plurality of alarm information extraction units, and reproduces it with the alarm information extraction unit. The alarm information extracting means extracts the alarm information included in the reproduction signal according to the transmission speed, so that even if it is necessary to support a plurality of transmission methods, the optical signal reception is performed. It is possible to construct a simplified optical transmission system by sharing devices.
Further, since the reproducing means outputs clock frequency information, the circuit configuration can be simplified.

The invention according to claim 5 relates to the optical signal receiving apparatus according to any one of claims 1 to 4, wherein the selective connection means is the connection destination corresponding to the transmission speed information of the reproduction signal. If no alarm information extraction means is provided, an alarm indicating unmonitored is output.
Here, when the connection destination alarm information extraction means corresponding to the transmission speed information of the reproduction signal is not provided, the selection connection means outputs an alarm meaning unmonitored, so the corresponding alarm information extraction means Even if is not prepared, the wrong alarm will not be sent out.

The invention described in claim 6 relates to the optical signal receiver according to any one of claims 1 to 5, wherein the selective connection means receives the alarm information extracted by the alarm information extraction means, It is characterized by being sent to the downstream side.
Here, since the selective connection unit receives the alarm information extracted by the alarm information extraction unit and sends it to the downstream side, the alarm information can be reliably transferred.

According to a seventh aspect of the present invention, there is provided an optical / electrical conversion means for converting an optical signal including alarm information into an electrical reception signal, and a clock and data are received by receiving the reception signal from the optical / electrical conversion means. And an optical signal monitoring unit incorporated in and used in an optical signal receiving apparatus having a reproducing means for generating a reproduction signal, provided at least corresponding to a plurality of types of transmission systems having different transmission speeds. A plurality of alarm information extraction means for extracting alarm information included in the signal, and a plurality of alarm information extraction based on the transmission speed information sent from the transmission speed information acquisition means for acquiring the transmission speed information of the reproduction signal; Selecting a corresponding alarm information extraction means from among the means, and comprising a selection connection means for connecting the selected alarm information extraction means and the reproduction means. It is.
Here, the selective connection means selects the corresponding alarm information extraction means from the plurality of alarm information extraction means based on the transmission speed information obtained from the transmission speed information acquisition means, and reproduces the alarm information extraction means. The alarm information extracting means extracts the alarm information included in the reproduction signal according to the transmission speed, so that even if it is necessary to support a plurality of transmission methods, the optical signal reception is performed. It is possible to construct a simplified optical transmission system by sharing devices.

The invention according to claim 8 relates to the optical signal monitoring unit according to claim 7, wherein the selective connection means includes storage means for storing the transmission speed information in association with the alarm information extraction means at the connection destination. It is characterized by having.
Here, in the selection connection means, the alarm information extraction means associated with the transmission speed information stored in the storage means is selected and connected to the selected alarm information extraction means and the reproduction means. Therefore, a simplified optical transmission system can be constructed by sharing an optical signal receiving apparatus.

A ninth aspect of the invention relates to the optical signal monitoring unit according to the seventh or eighth aspect, wherein the transmission rate information acquisition means includes frequency detection means for detecting the frequency of the reproduction signal. .
Here, the transmission speed information acquisition means detects the frequency of the reproduction signal by the frequency detection means, obtains transmission speed information and sends it to the selective connection means, and the selective connection means is obtained from the transmission speed information acquisition means. Based on the transmission rate information, a corresponding alarm information extraction unit is selected from a plurality of alarm information extraction units, and the alarm information extraction unit and the reproduction unit are connected. Accordingly, the alarm information included in the reproduction signal is extracted, so even if it is necessary to support a plurality of transmission methods, the optical signal receiving device is shared and a simplified optical transmission system is constructed. be able to.

A tenth aspect of the present invention relates to the optical signal monitoring unit according to the seventh or eighth aspect, wherein the reproduction means transmits clock frequency information to the transmission speed information acquisition means, and the transmission speed information acquisition means. Has a transmission rate information converting means for converting the frequency information into the transmission rate information.
Here, the reproducing means transmits the frequency information of the clock to the transmission speed information acquisition means, and the transmission speed information acquisition means converts the frequency information into the transmission speed information by the transmission speed information conversion means, to the selective connection means. Based on the transmission rate information obtained from the transmission rate information acquisition unit, the sending / selecting connection unit selects a corresponding alarm information extraction unit from among a plurality of alarm information extraction units, and reproduces it with the alarm information extraction unit. The alarm information extracting means extracts the alarm information included in the reproduction signal according to the transmission speed, so that even if it is necessary to support a plurality of transmission methods, the optical signal reception is performed. It is possible to construct a simplified optical transmission system by sharing devices.
Further, since the reproducing means outputs clock frequency information, the circuit configuration can be simplified.

An eleventh aspect of the present invention relates to the optical signal monitoring unit according to any one of the seventh to tenth aspects, wherein the selective connection means is the connection destination corresponding to the transmission speed information of the reproduction signal. If no alarm information extraction means is provided, an alarm indicating unmonitored is output.
Here, when the connection destination alarm information extraction means corresponding to the transmission speed information of the reproduction signal is not provided, the selection connection means outputs an alarm meaning unmonitored, so the corresponding alarm information extraction means Even if is not prepared, the wrong alarm will not be sent out.

The invention according to claim 12 relates to the optical signal monitoring unit according to any one of claims 7 to 11, wherein the selective connection means receives the alarm information extracted by the alarm information extraction means, It is characterized by being sent to the downstream side.
Here, since the selective connection unit receives the alarm information extracted by the alarm information extraction unit and sends it to the downstream side, the alarm information can be reliably transferred.

According to a thirteenth aspect of the present invention, an optical signal monitoring method according to the present invention converts an optical signal including alarm information into an electrical reception signal by an optical / electrical conversion means, and from the optical / electrical conversion means by a reproducing means. Receiving the received signal to reproduce the clock and data to generate a reproduction signal,
The transmission rate information acquisition unit acquires the transmission rate information of the reproduction signal, and extracts predetermined alarm information from among a plurality of alarm information extraction units provided corresponding to at least a plurality of types of transmission methods having different transmission rates. The alarm information included in the reproduction signal is extracted by the means, and the corresponding alarm information extraction means is selected and selected from the plurality of alarm information extraction means based on the transmission speed information by the selection connection means. The alarm information extracting means and the reproducing means are connected to each other.
Here, the selective connection means selects the corresponding alarm information extraction means from the plurality of alarm information extraction means based on the transmission speed information obtained from the transmission speed information acquisition means, and reproduces the alarm information extraction means. The alarm information extracting means extracts the alarm information included in the reproduction signal according to the transmission speed, so that even if it is necessary to support a plurality of transmission methods, the optical signal reception is performed. It is possible to construct a simplified optical transmission system by sharing devices.

The invention according to claim 14 relates to the optical signal monitoring method according to claim 13, wherein the selective connection means includes storage means for storing the transmission speed information in association with the alarm information extraction means at the connection destination. It is characterized by having.
Here, in the selection connection means, the alarm information extraction means associated with the transmission speed information stored in the storage means is selected and connected to the selected alarm information extraction means and the reproduction means. Therefore, a simplified optical transmission system can be constructed by sharing an optical signal receiving apparatus.

The invention according to claim 15 relates to the optical signal monitoring method according to claim 13 or 14, characterized in that the transmission rate information acquisition means detects the frequency of the reproduction signal by a frequency detection means. .
Here, the transmission speed information acquisition means detects the frequency of the reproduction signal by the frequency detection means, obtains transmission speed information and sends it to the selective connection means, and the selective connection means is obtained from the transmission speed information acquisition means. Based on the transmission rate information, a corresponding alarm information extraction unit is selected from a plurality of alarm information extraction units, and the alarm information extraction unit and the reproduction unit are connected. Accordingly, the alarm information included in the reproduction signal is extracted, so even if it is necessary to support a plurality of transmission methods, the optical signal receiving device is shared and a simplified optical transmission system is constructed. be able to.

The invention according to claim 16 relates to the optical signal monitoring method according to claim 13 or 14, wherein the reproducing means transmits clock frequency information to the transmission speed information acquisition means, and the transmission speed information acquisition means. Is characterized in that the frequency information is converted into the transmission rate information by transmission rate information conversion means.
Here, the reproducing means transmits the frequency information of the clock to the transmission speed information acquisition means, and the transmission speed information acquisition means converts the frequency information into the transmission speed information by the transmission speed information conversion means, to the selective connection means. Based on the transmission rate information obtained from the transmission rate information acquisition unit, the sending / selecting connection unit selects a corresponding alarm information extraction unit from among a plurality of alarm information extraction units, and reproduces it with the alarm information extraction unit. The alarm information extracting means extracts the alarm information included in the reproduction signal according to the transmission speed, so that even if it is necessary to support a plurality of transmission methods, the optical signal reception is performed. It is possible to construct a simplified optical transmission system by sharing devices.
Further, since the reproducing means outputs clock frequency information, the circuit configuration can be simplified.

The invention according to claim 17 relates to the optical signal monitoring method according to any one of claims 13 to 16, wherein the selective connection means is the connection destination corresponding to the transmission speed information of the reproduction signal. If no alarm information extraction means is provided, an alarm indicating unmonitored is output.
Here, when the connection destination alarm information extraction means corresponding to the transmission speed information of the reproduction signal is not provided, the selection connection means outputs an alarm meaning unmonitored, so the corresponding alarm information extraction means Even if is not prepared, the wrong alarm will not be sent out.

The invention according to claim 18 relates to the optical signal monitoring method according to any one of claims 13 to 17, wherein the selective connection means receives the alarm information extracted by the alarm information extraction means, It is characterized by being sent to the downstream side.
Here, since the selective connection unit receives the alarm information extracted by the alarm information extraction unit and sends it to the downstream side, the alarm information can be reliably transferred.

  According to the configuration of the present invention, the selective connection means selects the corresponding alarm information extraction means from the plurality of alarm information extraction means based on the transmission speed information obtained from the transmission speed information acquisition means, and When the information extraction means and the reproduction means are connected and the alarm information extraction means extracts the alarm information included in the reproduction signal according to the transmission speed, it is necessary to support a plurality of transmission methods. However, a simplified optical transmission system can be constructed by sharing an optical signal receiving device.

  Based on the transmission rate information obtained from the transmission rate information acquisition unit, the selective connection unit selects a corresponding alarm information extraction unit from the plurality of alarm information extraction units, and the alarm information extraction unit and the reproduction unit are selected. Even if the alarm information extracting means is connected to extract a plurality of alarm information included in the reproduction signal according to the transmission speed, the optical signal receiving device can be used. The purpose of building a common and simplified optical transmission system was realized.

  1 is a block diagram showing a configuration of an optical signal receiver according to a first embodiment of the present invention, FIG. 2 is a block diagram showing a configuration of a performance monitor circuit of the optical signal receiver, and FIG. FIG. 4 is a block diagram showing the configuration of the selective connection unit of the monitor circuit, and FIG. 4 is a diagram showing a correspondence table stored in the storage unit of the selective connection unit.

The optical signal receiver 1 of this example has an optical communication monitoring function. As shown in FIG. 1, an optical / electrical conversion circuit 2 that converts an input optical signal into an electrical signal, and an input electrical signal A clock / data recovery circuit 3 for recovering a clock signal and a data signal based on the clock signal, a branch circuit 4 for sending the clock signal to the frequency detection circuit 5 and the performance monitor circuit 6, and, for example, measuring the number of pulses based on the clock signal The frequency detection circuit 5 that detects the frequency to identify the bit rate and sends the bit rate information to the performance monitor circuit 6, and is reproduced by the clock and data reproduction circuit 3 based on the bit rate information received from the frequency detection circuit 5. And a performance monitor circuit 6 for extracting alarm information from the data signal and performing quality control of the transmission path and the transmitted signal. It has become Te.
The optical signal receiver 1 is paired with an optical signal transmitter and constitutes a modularized optical signal transmitter / receiver (transmission device). A plurality of optical signal transceivers are connected via a transmission line using, for example, an optical fiber cable to constitute an optical transmission system.

  As shown in FIG. 2, the performance monitor circuit 6 is sent at a predetermined bit rate to a selection connection unit 7 that selects a predetermined connection destination (selects a predetermined performance monitor function) based on the bit rate information. It has a plurality of first monitor units 8a, second monitor units 8b,... As connection destinations for extracting alarm information from incoming data signals, and the extracted alarm information conforms to a standard corresponding to a predetermined bit rate. Alarm information sent to the downstream side.

As shown in FIG. 3, the selective connection unit 7 includes a switching control unit 11 that controls each component, a storage unit 12, and a clock / data recovery circuit 3 and a first monitoring unit 8 a under the control of the switching control unit 11. And a switching section 14 for connecting / disconnecting the second monitor section 8b,...
The switching control unit 11 executes various processing programs stored in the storage unit 12, controls various components using various registers and flags secured in the storage unit 12, and executes a selection switching control process and the like.
Further, the switching control unit 11 identifies the monitor units (first monitor unit 8a, second monitor unit 8b,...) By monitor unit IDs ((0001), (0002),...).

The storage unit 12 includes a semiconductor memory such as a ROM and a RAM, and stores a program storage area in which various processing programs such as a selection switching control processing program executed by the switching control unit 11 are stored, a correspondence table, setting information, and the like. And an information storage area in which various information is stored.
In the selection switching control processing program, based on the bit rate information corresponding to the transmission method type sent from the frequency detection circuit 5, a monitor unit (first monitor unit 8a, The second monitor unit 8b,... Is selected, and the switching unit 14 is connected so that the selected monitor units (first monitor unit 8a, second monitor unit 8b,...) Are connected to the clock / data recovery circuit 3. A procedure for sending a connection control signal for operating the network is described.

As shown in FIG. 4, the correspondence table 12a stores the bit rate information for each transmission method type in association with the connected monitor units (first monitor unit 8a, second monitor unit 8b,...). Yes.
In this example, the first monitor unit 8a, the second monitor unit 8b, the third monitor unit 8c, the fourth monitor unit 8d, the fifth monitor unit 8e, the sixth monitor unit 8f,. System type: OC (Optical Carrier) -3, STM (Synchronous Transport Module) -1), type number 2 (transmission system type: OC-12, STM-4), type number 3 (transmission system type: FC), type Alarm information extraction processing is performed for signals of number 4 (transmission method type: GbE), type number 5 (transmission method type: 2GFC), type number 6 (transmission method type: OC-48, STM-16),. Is associated with.

Here, type number 1 (transmission method type: OC-3, STM-1), type number 2 (transmission method type: OC-12, STM-4), type number 6 (transmission method type: OC-48, STM) -16) shows the transmission system of the SONET / SDH network.
SONET / SDH is a high-speed optical transmission method used in backbone networks that use optical fiber cables as transmission cables (transmission media). Frames received from multiple relatively low speed lines are combined into a single frame. By transmitting this, time division multiplexing is performed.

STM means synchronous transfer mode. In this transmission method, information is transmitted by a frame structure in which channels are defined at periodic time positions, and the channels are periodically transmitted regardless of the presence or absence of information to be transmitted. appear. STM-n (n: 0 or a natural number) means a multiplexing form (transmission unit) and represents the nth digital hierarchy (speed layer) in multiplexing.
Note that STM-n is a notation method in SDH. In SONET, it is expressed as OC-m, and m = 3n (where n = 0, m = 1).

Type number 3 (transmission method type: FC) and type number 5 (transmission method type: 2GFC) indicate the transmission method of the FC network. The FC network uses a transmission system that conforms to ANSI (American National Standard Institute) FCS (Fibre Channel Fiber Standard). For example, computers are connected in a cluster or computers are connected to storage devices such as disk array devices. Used when
A type number 4 (transmission method type: GbE) indicates a transmission method of the GbE network. In the GbE network, an optical fiber is applied as a transmission cable to Ethernet (Ethernet (registered trademark)), which is one of the LAN standards, and a transmission system that achieves high speed is used. In GbE, the same specifications as FC are adopted for the physical layer.

  The type number 1 (transmission method type: OC-3, STM-1) has a bit rate of 155.52 [Mbps], and the type number 2 (transmission method type: OC-12, STM-4) has a bit rate. Is 622.08 [Mbps], type number 3 (transmission method type: FC), bit rate is 1062.50 [Mbps], and type number 4 (transmission method type: GbE) is 1250.00 [Mbps]. ], Type number 5 (transmission method type: 2GFC) has a bit rate of 2125.00 [Mbps], and type number 6 (transmission method type: OC-48, STM-16) has a bit rate of 2488.32 [Mbps]. ] Correspond to each.

Next, the operation of the optical signal receiver 1 of this example will be described with reference to FIGS.
As shown in FIG. 1, when an optical signal a1 transmitted through an optical fiber as an optical transmission line is input to an optical signal receiver 1A, the optical / electrical conversion circuit 2 converts the input optical signal into an electrical signal a2. Then, the clock / data recovery circuit 3 regenerates and outputs the clock signal a3 and the data signal a4 based on the input electrical signal.
The clock signal a3 output from the clock / data recovery circuit 3 is sent to the branch circuit 4, and the data signal a4 is sent to the performance monitor circuit 6. The branch circuit 4 sends the clock signal a3 to the frequency detection circuit 5 and the performance monitor circuit 6.
The frequency detection circuit 5 detects the frequency by, for example, measuring the number of pulses based on the clock signal a3, specifies the bit rate, and sends the bit rate information a5 to the performance monitor circuit 6.

  As shown in FIGS. 2 and 3, in the performance monitor circuit 6, the switching control unit 11 of the selective connection unit 7 is based on the bit rate information a 5 corresponding to the transmission method type sent from the frequency detection circuit 5. The first monitor unit 8a (second monitor unit 8b, third monitor unit 8c,...) As a connection destination corresponding to the bit rate information a5 is selected, and the selected first monitor unit 8a (second monitor unit) is selected. 8b, the third monitor unit 8c,...) Send a connection control signal a6 for operating the switching unit 14 so as to be connected to the clock / data recovery circuit 3.

Thus, the first monitor unit 8a (second monitor unit 8b, third monitor unit 8c,...) And the clock / data recovery circuit 3 are connected, and the first monitor unit 8a (second monitor unit 8b, third monitor) is connected. The units 8c,...) Perform monitoring (performance monitoring) for quality control of the transmission path and the transmitted signal in accordance with the bit rate of the input signal.
The first monitor unit 8a (second monitor unit 8b, third monitor unit 8c,...) Extracts the alarm information a7 from the data signal a4 sent from the clock / data recovery circuit 3, and sends it to the selective connection unit 7. .
In the selective connection unit 7, when the switching control unit 11 receives the alarm information, the alarm information a7 is sent to the downstream apparatus.

Assuming that the input optical signal a1 is transmitted according to the SONET / SDH network standard (for example, type number 1 (transmission method type: OC-3, STM-1)), the frequency detection circuit 5 Information indicating that the bit rate is “155.52 [Mbps]” is sent to the performance monitor circuit 6 as the bit rate information a5 to be performed.
In the performance monitor circuit 6, the switching control unit 11 of the selection connection unit 7 connects based on the bit rate information a 5 corresponding to the transmission method type sent from the frequency detection circuit 5. The first monitor unit 8a (connection destination monitor unit ID: “0001”) is selected as the destination, and the switching unit 14 is set so that the selected first monitor unit 8a is connected to the clock / data recovery circuit 3. A connection control signal a6 for operating is sent.

Thus, for example, the first monitor unit 8a and the clock / data recovery circuit 3 are connected, and the first monitor unit 8a performs performance monitoring in accordance with the bit rate of the input signal. The first monitor unit 8 a extracts the alarm information a 7 from the data signal a 4 sent from the clock / data recovery circuit 3 and sends it to the selective connection unit 7.
The SONET / SDH network has two types of overhead areas of section management information (SOH: Section Over Head) and path management information (POH: Pass Over Head) in the frame. The section management information is used in the relay transmission path section and transferred as maintenance / operation information such as operation status display and error monitoring. Further, the path management information is used in the multiplexing device section and transferred for operation status display, alarm information display, maintenance signal accommodation, multiplexing structure display, and the like.

The first monitor 8a extracts alarm information a7 included in the overhead area of the data signal a4.
In the selective connection unit 7, when the switching control unit 11 receives the alarm information a7, the alarm information a7 is sent to the downstream apparatus.
Thus, the performance monitor circuit 6 outputs the clock signal a3, the data signal a4, and the alarm information a7.

Thus, according to the configuration of this example, the frequency detection circuit 5 for specifying the bit rate is provided, and a plurality of first monitors corresponding to the respective bit rates are provided in the single optical signal receiver 1. .., And a performance monitor circuit 6 that is automatically selected according to the bit rate is incorporated, so that a plurality of types corresponding to each bit rate can be obtained. There is no need to prepare an optical signal receiver. Therefore, an optical transmission system can be constructed using a common optical signal receiver regardless of the bit rate (and the corresponding standard).
That is, even when it is necessary to support a plurality of transmission schemes, a simplified optical transmission system can be constructed by sharing an optical signal receiver.

In particular, in an optical transmission system in which a plurality of types of transmission methods are mixed, for example, when a large number of optical signal receivers are arranged at the time of introduction, it is only necessary to arrange the same type of optical signal receivers, so that it does not take time. . Also, when a part of the optical transmission system is changed to another type of transmission method, it does not take time. In addition, operation and maintenance can be facilitated.
Further, by connecting an optical signal receiver, the bit rate, that is, the transmission method can be easily grasped at an arbitrary relay point (or termination unit).

FIG. 5 is a block diagram showing a configuration of an optical signal receiver according to the second embodiment of the present invention.
The difference between this example and the first embodiment described above is that bit rate information conversion is performed in which frequency information of the clock signal is output from the clock / data recovery circuit and frequency information is converted into bit rate information instead of the frequency detection circuit. The circuit is provided.
Since the other configuration is substantially the same as the configuration of the first embodiment described above, the description thereof will be simplified.

  The optical signal receiver 1A in this example has an optical communication monitoring function. As shown in FIG. 5, an optical / electrical conversion circuit 2 that converts an input optical signal into an electrical signal, and an input electrical signal A clock / data recovery circuit 16 that regenerates a clock signal and a data signal based on the clock signal and outputs frequency information of the clock signal, a bit rate information conversion circuit 17 that converts the frequency information into bit rate information, and a bit rate information conversion circuit 17. And a performance monitor circuit 6 for extracting alarm information from the data signal reproduced by the clock / data reproduction circuit 3 based on the bit rate information received from the transmission line and performing quality control of the transmission path and the transmitted signal. It has become.

Next, the operation of the optical signal receiver 1A of this example will be described with reference to FIG.
As shown in FIG. 5, when an optical signal b1 transmitted through an optical fiber as an optical transmission line is input to the optical signal receiver 1A, the optical / electrical conversion circuit 2 converts the input optical signal into an electrical signal b2. Then, the clock / data recovery circuit 16 regenerates and outputs the clock signal b3 and the data signal b4 based on the input electrical signal. The clock / data recovery circuit 16 further outputs frequency information b5 of the clock signal.
The clock signal b3 and the data signal b4 output from the clock / data recovery circuit 16 are sent to the performance monitor circuit 6, and the frequency information b5 is sent to the bit rate information conversion circuit 17.
The bit rate information conversion circuit 17 specifies the bit rate based on the frequency information b 5 received from the clock / data recovery circuit 16 and sends the bit rate information b 6 to the performance monitor circuit 6.

  In the performance monitor circuit 6, the switching control unit 11 of the selection connection unit 7 corresponds to the bit rate information b6 based on the bit rate information b6 corresponding to the transmission method type sent from the bit rate information conversion circuit 17. The first monitor unit 8a (second monitor unit 8b, third monitor unit 8c,...) As the connection destination is selected, and the selected first monitor unit 8a (second monitor unit 8b, third monitor unit 8c, ...) sends a connection control signal for operating the switching unit 14 so as to be connected to the clock / data recovery circuit 16.

Thus, the first monitor unit 8a (second monitor unit 8b, third monitor unit 8c,...) And the clock / data recovery circuit 3 are connected, and the first monitor unit 8a (second monitor unit 8b, third monitor) is connected. The units 8c,...) Perform monitoring (performance monitoring) for quality control of the transmission path and the transmitted signal in accordance with the bit rate of the input signal.
The first monitor unit 8a (second monitor unit 8b, third monitor unit 8c,...) Extracts alarm information b7 from the data signal b4 sent from the clock / data recovery circuit 16 and sends it to the selective connection unit 7. .
In the selective connection unit 7, when the switching control unit 11 receives the alarm information b7, the alarm information b7 is sent to the downstream apparatus.

According to the configuration of this example, it is possible to obtain substantially the same effect as that of the first embodiment described above.
In addition, since the clock / data recovery circuit outputs the frequency information of the clock signal, the circuit configuration can be simplified.

The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and there are design changes and the like without departing from the gist of the present invention. Are also included in the present invention.
For example, in the above-described embodiment, when the corresponding monitor unit is not prepared in the performance monitor circuit, the selective connection unit, for example, performs the performance monitor non-execution in the optical signal receiver as alarm information. You may make it send out including the alarm information which means. Thereby, even if the corresponding monitor unit is not prepared, an erroneous alarm is not sent out.
Further, as the clock / data recovery circuit, a circuit operating with a reference clock may be used.

Further, the monitor unit of the performance monitor circuit may be configured to be able to be added, replaced, and removed.
Further, for example, as a SONET / SDH network standard, type number 1 (transmission method type: OC-3, STM-1 (bit rate: 155.52 [Mbps])), type number 2 (transmission method type: OC- 12, STM-4 (bit rate: 622.08 [Mbps])), type number 6 (transmission method type: OC-48, STM-16 (bit rate: 2488.32 [Mbps])) In addition, transmission method type: OC-1, STM-0 (bit rate: 51.84 [Mbps]), transmission method type: OC-192, STM-64 (bit rate: 10 [Gbps]), transmission A monitor unit corresponding to system type: OC-768, STM-256 (bit rate: 40 [Gbps]) may be added.
Further, the performance monitor circuit may include a frequency detection circuit and a bit rate information conversion circuit.
Further, it may be terminated by this optical signal receiver, or an optical signal may be transferred.

  As a performance monitor circuit, the present invention can be applied not only when alarm information is extracted but also when an optical signal measurement function and an evaluation function are provided.

1 is a block diagram showing a configuration of an optical signal receiver that is a first embodiment of the present invention; FIG. It is a block diagram which shows the structure of the performance monitor circuit of the optical signal receiver. It is a block diagram which shows the structure of the selection connection part of the same performance monitor circuit. It is a figure which shows the corresponding | compatible table memorize | stored in the memory | storage part of the selection connection part. It is a block diagram which shows the structure of the optical signal receiver which is 2nd Example of this invention. It is explanatory drawing for demonstrating a prior art. It is explanatory drawing for demonstrating a prior art.

Explanation of symbols

1,1A optical signal receiver (optical signal receiver)
2,15 Optical / electrical conversion circuit (optical / electrical conversion means)
3,16 Clock data recovery circuit (reproduction means)
5 Frequency detection circuit (Transmission rate information acquisition means)
6,18 Performance monitor circuit (optical signal monitoring unit)
7 Selection connection (selection connection means)
8a, 8b, ... 1st monitor part, 2nd monitor part, ... (alarm information extraction means, frequency detection means)
11 switching control unit 12 storage unit (storage unit)
17 Bit rate information conversion circuit (transmission speed information acquisition means, transmission speed information conversion means)

Claims (18)

An optical / electrical conversion means for converting an optical signal including alarm information into an electrical reception signal; and a reproduction means for receiving the reception signal from the optical / electrical conversion means and reproducing a clock and data to generate a reproduction signal; An optical signal receiving device comprising:
Transmission rate information acquisition means for acquiring transmission rate information of the reproduction signal, and a plurality of alarm information provided corresponding to at least a plurality of types of transmission methods having different transmission rates, and extracting alarm information included in the reproduction signal A selection unit that selects a corresponding alarm information extraction unit from among the plurality of alarm information extraction units based on the transmission rate information, and connects the selected alarm information extraction unit and the reproduction unit. An optical signal receiving device comprising: a connecting means.   2. The optical signal receiving apparatus according to claim 1, wherein the selective connection unit includes a storage unit that stores the transmission rate information in association with the alarm information extraction unit that is a connection destination.   3. The optical signal receiving apparatus according to claim 1, wherein the transmission rate information acquisition unit includes a frequency detection unit that detects a frequency of the reproduction signal.   The reproduction means transmits clock frequency information to the transmission speed information acquisition means, and the transmission speed information acquisition means includes transmission speed information conversion means for converting the frequency information into the transmission speed information. The optical signal receiving device according to claim 1 or 2.   The said selection connection means outputs the warning which means unmonitoring, when the said warning information extraction means of the connection destination corresponding to the said transmission rate information of the said reproduction signal is not provided. The optical signal receiving apparatus according to any one of 1 to 4.   The optical signal receiving apparatus according to claim 1, wherein the selective connection unit receives the alarm information extracted by the alarm information extraction unit and transmits the alarm information to a downstream side. An optical / electrical conversion means for converting an optical signal including alarm information into an electrical reception signal; and a reproduction means for receiving the reception signal from the optical / electrical conversion means and reproducing a clock and data to generate a reproduction signal; An optical signal monitoring unit used by being incorporated in an optical signal receiving device comprising:
A plurality of alarm information extraction means provided corresponding to at least a plurality of types of transmission methods having different transmission speeds, and for extracting alarm information included in the reproduction signal;
Based on the transmission rate information sent from the transmission rate information acquisition unit for acquiring the transmission rate information of the reproduction signal, a corresponding alarm information extraction unit is selected from the plurality of alarm information extraction units, and is selected. An optical signal monitoring unit comprising: a selective connection means for connecting the alarm information extraction means and the reproduction means.   The optical signal monitoring unit according to claim 7, wherein the selective connection unit includes a storage unit that stores the transmission rate information in association with the alarm information extraction unit that is a connection destination.   9. The optical signal monitoring unit according to claim 7, wherein the transmission rate information acquisition unit includes a frequency detection unit that detects a frequency of the reproduction signal.   The reproduction means transmits clock frequency information to the transmission speed information acquisition means, and the transmission speed information acquisition means includes transmission speed information conversion means for converting the frequency information into the transmission speed information. The optical signal monitoring unit according to claim 7 or 8.   The said selection connection means outputs the warning which means unmonitoring, when the said warning information extraction means of the connection destination corresponding to the said transmission rate information of the said reproduction signal is not provided. The optical signal monitoring unit according to any one of 7 to 10.   12. The optical signal monitoring unit according to claim 7, wherein the selective connection unit receives the alarm information extracted by the alarm information extraction unit and transmits the alarm information to the downstream side. An optical signal including alarm information is converted into an electrical reception signal by the optical / electrical conversion means, and the reception signal is received from the optical / electrical conversion means by the reproduction means, and the clock and data are reproduced to generate the reproduction signal. Generate
The transmission rate information acquisition unit acquires the transmission rate information of the reproduction signal, and extracts predetermined alarm information from among a plurality of alarm information extraction units provided corresponding to at least a plurality of types of transmission methods having different transmission rates. Means for extracting alarm information contained in the reproduction signal;
Based on the transmission rate information, the selection connection unit selects a corresponding alarm information extraction unit from among the plurality of alarm information extraction units, and connects the selected alarm information extraction unit and the reproduction unit. An optical signal monitoring method.   14. The optical signal monitoring method according to claim 13, wherein the selective connection unit includes a storage unit that stores the transmission rate information in association with the alarm information extraction unit as a connection destination.   15. The optical signal monitoring method according to claim 13, wherein the transmission rate information acquisition unit detects the frequency of the reproduction signal by a frequency detection unit.   The reproduction unit transmits clock frequency information to the transmission rate information acquisition unit, and the transmission rate information acquisition unit converts the frequency information into the transmission rate information by a transmission rate information conversion unit. The optical signal monitoring method according to claim 13 or 14.   The said selection connection means outputs the warning which means unmonitoring, when the said warning information extraction means of the connection destination corresponding to the said transmission rate information of the said reproduction signal is not provided. The optical signal monitoring method according to any one of 13 to 16. 18. The optical signal monitoring method according to claim 13, wherein the selective connection unit receives the alarm information extracted by the alarm information extraction unit and sends the alarm information downstream.

Images